Artificial tooth.



E. L. TOWNSEND.

ARTIFICIAL TOOTH. A PPLIOATION rum) mm: 14, 1009.

fizveiezoz;

flier/lay Patented Mar. 15,1910.

being cast thereon.

EMORY L. TOWNSEND, OF LOS ANGELES, CALIFORNIA.

ARTIFICIAL roo'rrr.

Specification of Letters Patent. Patentefl M 11, 1L5,- 191169, I

Application filed June 14,- 1909. Serial Noi 501,904.

To all whom 'it may concern:

Be it known that I, EMORY L. TOWNS/END,

a citizen of the United States, residing at the city of Los Angeles,county of Los Angeles, State of California, have invented new and usefulImprovements in Artificial Teeth, of which the following is aspecification.

My invention relates to that class of ar ti ficial teeth which areprincipally used in bridge work and crown work; and the object thereofis to provide a simple and inexpensive tooth which will possess greatstrength and which can be mounted in bridge work with a minimum amountof labor. I accomplish this object by the tooth described herein andillustrated in the accompanying drawings in which,

Figure 1 is an edge or end view of Fig. 2. Fig. 2 shows two of myimproved teeth arranged for abridge, the metal base or socket Fig.3 is alongitudinal, central, vertical section of a single tooth having itsmetal base or socket cast thereon.

Fig. 4 1s an edge elevation of one. ofmy im-- proved teeth with the castmetal base or socket omitted.

My improved tooth is composed of the porcelain body 5 which is providedon each side with vertical grooves 6 which are preferably ,V-shaped andextend from the base of the tooth toward the outer end. I prefer to havethese grooves extend about one half the length of the tooth. In the bodyof the tooth preferably near the outer ends of these grooves and openinginto the same are recesses or depressions 7 which are preferablysemi-globular. These depressions are part of the grooves and form thedeeper ortions of the grooves. They may be locat in any part'of theroove above the root end, but are preferab y at the outer end. In thebase I provide a transverse groove 8 which opens into the side grooves.

The-inner edge of the base of the tooth is preferably provided with arabbet 9. This rabbet may be omitted, but I prefer its use as therebythe metal base or socket 10 is thicker and stronger than it would be ifthe rabbet were omitted.

. opening through In using in tooth -for .bridge-work the teeth for theridge are secured in-a mold which is formed to cast the metal base or li socket portion of the bridge upon the base of the teeth. When themetal is poured into the mold it enters the grooves in the teeth andinto the recesses opening out of such grooves and when the liquid metalsolidifies the teeth are firmly held together. The metal in the grooveshold the teeth from any transverse movement and the small knobs' 11whichfill the de ressions 7 hold the body from se aratingf f'om themetal. An other form 0 depression will be equally e ective, it beingonly necessary that at some point above the base the grooves shallapproach each other.

I am aware that artificial teeth have been made in which side grooveshave been provided, but such side grooves were so arranged that thetooth would slip on and off ribs provided in the socket cup, andthesocket and tooth were secured together by cement. I. therefore, donot broadly claim a tooth with groovesin the sides thereof, as

. my invention consists in grooves in the sides of the body with someportions thereof closer than at the base.

Having described my claim is;

invention what I artificial tooth comprising a porcelain body memberhaving side grooves opening through its root end, said grooves beingdeeper at'some point above the root end than at the root end. I

2. An artificial tooth comprising a body member having'grooves in thesides and the root end thereof, said grooves at some point above theroot end being deeper than at the root end, in combination with a castmetal base or socket cast upon the tooth.

In witness have hereunto subscribed my name this day of June, 1909.

- EMORY L. TOWNSEND.

Witnesses:

G. E. HARPHAM, S. B. AUs'rIN.

that I claim the foregoing

